Characteristics and Applications of Commonly Used Mild Surfactants
In recent years, the number of people with sensitive skin has been increasing, and there is a growing demand for mild cleansing products. Currently, the mild surfactants commonly used in the market can be categorized into sarcosine type, glycine type, glutamic acid type, sodium hydroxyethyl sulfonate type, methyl taurine type and so on according to different hydrophilic ends.
Different hydrophilic ends have a greater impact on the performance of surfactants, such as water solubility, foam performance, rinsing sensation, and skin feeling after washing.
Sarcosine type surfactants
The market is dominated by sodium lauroyl sarcosinate. This type of surfactant has good water solubility, relatively easy to thicken, rich foam, and a refreshing wash feeling, which is very suitable for transparent products, such as shampoos and shower gels.
Commercially available sodium or potassium cocoyl glycinate-based, wash feeling and soap-based closer to the soap, it is easy to rinse clean, but there is no soap-based tautness after washing, mainly used to make clean cream-type or mousse agent-type products.
Glutamic acid type surfactants
Commonly found are sodium lauroyl glutamate, sodium cocoyl glutamate or disodium. This type of surfactant has a moisturizing feeling after washing and is gentle to the skin, and is widely used in shampooing, cleansing and bathing products.
Sodium hydroxyethanesulfonate surfactants
Commonly known as sodium cocoyl hydroxyethyl sulfonate, this type of surfactant has less impact on the skin barrier function and has a moisturizing sensation after washing, and is often used to make solid-agent cleansing products, such as bath soaps, shampoo soaps, and facial cleansing soaps.
Methyl taurine surfactants
Sodium cocoyl methyl taurate and sodium lauroyl methyl taurate are common, and this type of surfactant has rich foam, good resistance to oil and hard water, and a moisturizing sensation on the skin and hair, and is widely used in shampoos, shower gels, and facial cleansing products.
Cocoyl methyl taurine sodium taurate
Taurine is introduced on the basis of sodium cocoylmethyl taurate to make it a mild surfactant of double taurine type. This bis-taurine type surfactant not only retains the excellent foam performance of mono-taurine type, but also has better mildness, but it is less reported in China at present.
The bis-taurine-type surfactant has better mildness than traditional sulfate surfactants; in deionized water, the foam performance (including foaming and foam stability) of Sodium Cocoyl Methyl Taurate Taurine in the weak acidic range is excellent compared with that in the alkaline range; the bis-taurine-type surfactant has good resistance to hard water and sebum cleansing ability in the weak acidic range; in the weak acidic range, it has better mildness than the traditional sulfate surfactant Sodium Cocoyl Methyl Taurate Taurine. In the weak acid range, Hostapon® CDT has higher foam height and comparable foam stability compared to SLES, a traditional sulfate surfactant; when used in shampoos, taurine cocoylmethyl taurate partially replaces the traditional sulfate surfactant, providing better smoothness, softness and consumer acceptance.
As an anionic surfactant, Sodium Cocoyl Methyl Taurate Sulfonate has good mildness, rich foam volume, hard water resistance, moderate cleansing power for sebum, and will not cause excessive elution of sebum, and it is suitable for the development of mild detergent products, such as shampoos, shower gels, and facial cleansing products.
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